[mrathelsing]

References used to store a Span, which is later connected with the source and source_name of the root-file, giving confusing diagnostics for errors in imported files. The first commit adds a test to show this.
The 2nd commit fixes it by making Arc's of source and source_name available throughout the visitor, stores those in the References so they can be used to generate Warnings

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.81529% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.2%. Comparing base (3dbcdbd) to head (68b1c75).

Files with missing lines	Patch %	Lines
src/reader.rs	94.1%	4 Missing ⚠️
src/error.rs	97.5%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/compiler.rs	96.6% <100.0%> (-0.6%)	⬇️
src/model/schema.rs	96.9% <ø> (ø)
src/resolve.rs	99.6% <100.0%> (ø)
src/error.rs	98.5% <97.5%> (-1.5%)	⬇️
src/reader.rs	94.1% <94.1%> (-0.1%)	⬇️

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[jonhoo]

Approving since the last few bits are relatively minor/easy to fix